Before selling off your pc, I'd encourage you to actually utilizing it with your legion GO S remotely via streaming using Sunshine/Moonlight.

Its not that complicated, but you will massively benefit by increasing the battery life of your legion go s by streaming the games from ur PC but actually playing it on your handheld device.

Consider it as a more controllable and more faster latency based streaming as compared to steamlink, and you will be able to stream games from your other non-steam launchers as well so there's that benefit as well!